I think some privileges should be global to the Stack Exchange account.

I have been somewhat active on Stack Overflow for a long time, and have a little bit of reputation. I discovered not so long ago other Stack Exchange websites and the global account linking them. The thing is, I have less than 10 rep on most of them, because I didn't have the occasion of being active enough on them.

But I know Stack Overflow well now, and the global principles of Stack Exchange. So I was surprised and very frustrated noticing I couldn't do really basic things like upvoting a question on for example the Gamedev SE, just because on this particular board I wasn't active.

Shouldn't there be some privileges that are global? Or a way to unlock some basic privileges globally when you have a minimum rep on at least one of the sites?